Furnace.



Patented May 2|, I901. S. A. KNAPP.

F U R N A C E (Application filed Apr. 14, 1900.)

2 Sheets-Sheet I.

(No Model.)

,TNE uoluus Farm :41. wmoumm wwmcmu. o. C-

Patented May 2l IQOI.

S. A. KNAPP.

FURNACE.

(No Model.) (Animation med Apt 1900') 2 Sheets-Sheet 2.

5 mag THE NORRIS PzTzns on. PNOTQUTHQ. wnsnmomm n. c.

UNITED STATES PATENT FFlCE.

SEWELL A. KNAPP, OF HAWTHORNE, NEVADA, ASSIGNOR OFONE-I-IALF TO JOHN BALLARD, OF OAKLAND, CALIFORNIA.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 674,69, dated May 21, 1901. Application filed April 14, 1900- $erial No. 12,843. (No model.)

To all whom it may condor-n:

Be it. known that I, SEWELL A. KNAPP, a citizen of the United States, residing at Hawthorne, county of Esmeralda, State of Nevada, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the same.

The main objects of the present invention are to prolong the life or durability of the furnace, simplify the construction thereof, so as to lessen the cost thereof, and to provide for the repair of the arch of the furnace without necessitating the shutting down and cooling off, 1 5 the invention consisting in the arrangement of parts and details of construction, as will be hereinafter fully set forth in the drawings and described and pointed out in the specification.

In order to comprehend the invention, reference should be had to the accompanying sheet of drawings, wherein Figure 1 is a side view in elevation, partly in section, showing the Water-jacketed sectional arch. Fig. 2 is a front elevation, partly broken, of the same. Fig. 3 is a side elevation, partly in section, showing the sectional arch as compared to the free back sections. Fig. 4 is a cross-section of the same looking toward the front, and Fig. 5 is a plan view of one of the frames for the brick arch-sections.

In the drawings the letter A is used to indicate the furnace, the end walls A and side walls A being constructed, respectively,with a water-space or passage-way a a. The water is fed into the water-space or passage-way a of the end walls from water-supply pipes B and escapes therefrom through outlet-pipes B, while the water is fed to the Water-space or passage-way a of the side walls by means of the water-supply pipes B and escapes. therefrom through outlet-pipe B Fig. 2 of the drawings.

The bridge-wall O of the furnace is formed with a water-space or passage-way 0, into which water is conveyed by means of the pipe 0 the end 0 of which pipe extending into the said water-space or passage-way being perforated, so as to spray water into the waterspace. The water discharged into the bridgewall escapes therefrom through the outletpipe C. By preference the arch of the furnace is made in sections, each section D being formed with a water-space D, into which water is fed by means of pipes D and escapes through pipes D, the pipes D connecting with the water-supply pipe E and pipes D with the discharge-pipe E. By this manner of constructing the walls and arch of the furnace a water-jacketed furnace is produced, the durability of the furnace is increased, and the same is prevented from quickly burning out. Again,the furnace maybe constructed much lighter than where the walls and arch are made solid. It will be understood that these parts may be constructed of any suitable material, such as fire-clay, brick, or metal. 4

As stated, the arch is preferably made in sections, and each section of the arch is sus- 7o pended from arch-beams E by suspension rods or links E, which rods or links are provided with a turnbuckle b, by means of which the rods or links may be shortened or lengthened in order to raise or lower either of the sections desired. In case a section becomes damaged the same may be raised from its seat, removed, or swung aside and a new one inserted in lieu thereof, and this without stopping the work of the furnace, or in case it is desired to make repairs to the hearth E the arch may be readily raised for this purpose.

The cross-beams from which the arch-sections are suspended are supported by the buckstaves F, said staves being secured to the base of the furnace in any suitable manner.

In Fig. 1 of the drawings there is shown one of the Working doors in the side of the furnace, which upon the drawings is lettered G. This door slides sidewise upon rollers 9 although it is obvious that if so desired the door may move vertically. The said door is waterjacketed, having a hollow casing f. Water is supplied to it by the inlet-pipe g and escapes therefrom by a pipe 9.

It will be noticed that the arch-beams E (see Fig. 2 of the drawings) are provided with notches 6 The hangers or suspension rods or links E normally lie in these notches, although in the drawings the same are shown as removed from said notches. These notches are set wide apart, so as to cause the hanging strains of the arch-sections to be widely divergent, thus preventing the sections from swinging sidewise when lifted. Being set wide apart, the hangers would tend to slip together; but the notches prevent them from so slipping when the hangers or suspensionrods are fitted therein.

In Fig. 3 of the drawings the arch-sections are not shown as being water-jacketed, but built of fire-clay sections and are constructed as follows: There is an iron frame H, with two top bars h, provided with eyebolts h at their ends and an eyebolt 71 at their middle. These frames are segments of circles or arches, as shown in section, Fig. 4. The fire-bricks H fit down through these frames and are carried thereby, as seen in Fig. 4. These archsections correspond to the water-jacketed sec tions D in Fig. l and are suspended from the arch-beams E and lifted out in the same'manner as the water-jacketed sections D. The arch-sections are akin in the two figures-of the drawingsthat is, in Figs. 1 and 2being independent suspended sections capable of renewal, and the suspension is in the same manner in each case. In Figs. 3 and 4 of the drawings a fire-brick lining J is shown inside the waterjacketed side walls. The turnbuckles b permit of the arch-sections being raised and lowered and provide means for compensating for the expansion and contraction of the arch-sections under heating and cooling of the arch. As the arch heats, its sections expand, in which case the turnbuckles b are tightened up, so as to lift the arch-sections, thereby affording more room for compensating for the expansion. As the arch cools, reverse described operation. The arch is thus kept tight at all times.

By the foregoing-descri bed furnace the expansion and contraction of the arch-sections may be quickly taken up by the turnbuckles. The arch-sections may be quickly elevated or uplifted or removed in order to permit access to the interior of the furnace for repairing the hollow or side walls by swinging the sections over the damaged plates out. For this purpose it is not necessary to cool off the furnace except in extraordinary cases, thus saving a large amount of fuel used in heating up after repairs. The water-jacket behind the fire-brick lining J preserves the main walls and conducts the heat away from the back end of the fire-brick, and thus makes them longer lived.

The present invention relates to furnaces, generally reverberatory furnaces, arched or flat-topped, and is especially applicable to furnaces for smelting, roasting, heating,,reheating and annealing, tempering of ores, metals, and glassware.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a furnace and supporting-beams located above the same, of an arched roof for the furnace composed of a plurality of separate independently-removable sections, each section being independently supported from said beams by a plurality of spaced suspension devices, each of which devices is loosely and removably hung from one of said beams, whereby the sections are independently adjustable and removable and are prevented from swinging, substantially as described.

2. The combination with a furnace, of supporting-beams above the furnace-roof, an arched roof comprising a plurality of separate independently-removable sections, each section independently suspended and removable from the beams by a plurality of spaced suspension devices, each loosely and removably hung from one of the beams, whereby the sections are prevented from swinging, and means for raising and lowering the sections independently so as to compensate for expansion of the roof of the furnace when heated, substantially as described.

In witness whereof I have hereunto set my hand.

SEWELL A. KNAPP.

Witnesses:

WALTER F. VANE, D. B. RICHARDS. 

